/* components.css: buttons, forms, alerts, tags, lists, pagination, gradient surfaces */

/* ---------- Gradient surfaces (hero, approach section, footer) ----------
   Two stacked layers: the light gradient and the dark gradient. The theme switches
   their opacity, so the colours fade slowly instead of snapping. */
.gradient-surface {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--c-navy-2);
}
.gradient-surface::before,
.gradient-surface::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  transition: opacity var(--theme-duration) var(--theme-ease);
}
.gradient-surface::before { background: var(--g-light); opacity: var(--op-light); }
.gradient-surface::after { background: var(--g-dark); opacity: var(--op-dark); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.9rem;
  padding: 0.65rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease), box-shadow var(--t-med) var(--ease), transform var(--t-fast) var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: 0.65; cursor: progress; }
.btn--block { display: flex; width: 100%; }

.btn--primary { background: var(--btn-bg); color: var(--btn-text); box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--btn-bg-hover); color: var(--btn-text); }

.btn--secondary { background: transparent; border-color: var(--btn-outline); color: var(--btn-outline); }
.btn--secondary:hover { background: var(--highlight); color: var(--link-hover); }

.btn--light { background: var(--btn-light-bg); color: var(--btn-light-text); }
.btn--light:hover { background: var(--c-gold); color: #1a1405; }

.btn--outline-light { background: transparent; border-color: rgba(255, 255, 255, 0.55); color: #ffffff; }
.btn--outline-light:hover { background: rgba(255, 255, 255, 0.14); border-color: #ffffff; color: #ffffff; }

.btn--danger { background: var(--danger-solid); color: var(--on-danger); }
.btn--danger:hover { filter: brightness(0.92); color: var(--on-danger); }

@media (hover: hover) {
  .btn--primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-glow); }
}

/* ---------- Forms ---------- */
.form-field { margin-bottom: 1.1rem; }
.form-label { display: block; margin-bottom: 0.35rem; font-weight: 600; color: var(--heading); }
.form-hint { margin: 0.3rem 0 0; font-size: var(--fs-small); color: var(--text-muted); }
.form-hint--tight { margin: -0.5rem 0 1.1rem; }

.form-input {
  display: block;
  width: 100%;
  min-height: 2.9rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--input-bg);
  font: inherit;
  color: var(--text);
  transition: border-color var(--t-fast) var(--ease);
}
.form-input::placeholder { color: var(--text-muted); }
.form-input:focus { border-color: var(--focus); outline: 3px solid var(--focus); outline-offset: 1px; }
.form-input[aria-invalid='true'] { border-color: var(--danger-ink); }
select.form-input { appearance: auto; }
textarea.form-input { resize: vertical; }
.form-textarea { min-height: 18rem; font-family: Consolas, 'Courier New', monospace; font-size: 0.95rem; }

.form-row { display: grid; gap: 0 1.25rem; }
@media (min-width: 40rem) { .form-row { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.form-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.5rem; }

.input-group { display: flex; }
.input-group .form-input { border-top-right-radius: 0; border-bottom-right-radius: 0; }
.input-group__btn {
  min-width: 5rem;
  padding: 0 0.9rem;
  border: 1px solid var(--border-strong);
  border-left: 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--bg-tint);
  font: inherit;
  font-weight: 600;
  color: var(--heading);
  cursor: pointer;
}
.input-group__btn:hover { background: var(--highlight); }

/* ---------- Alerts ---------- */
.alert { margin-bottom: 1.25rem; padding: 0.9rem 1.1rem; border: 1px solid; border-radius: var(--radius); }
.alert p:last-child { margin-bottom: 0; }
.alert ul { margin: 0; padding-left: 1.1rem; list-style: disc; }
.alert--error { background: var(--danger-bg); border-color: var(--danger-border); color: var(--danger-text); }
.alert--success { background: var(--success-bg); border-color: var(--success-border); color: var(--success-text); }
.alert a { color: inherit; }

/* ---------- Status tags ---------- */
.status-tag {
  display: inline-block;
  padding: 0.15rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-tint);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}
.status-tag--published { background: var(--btn-bg); border-color: var(--btn-bg); color: var(--btn-text); }
.status-tag--off { background: transparent; border-style: dashed; color: var(--text-muted); }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs { margin-bottom: 1rem; font-size: var(--fs-small); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 0.35rem; list-style: none; }
.breadcrumbs li + li::before { content: '/'; margin-right: 0.35rem; color: var(--accent); }
.breadcrumbs [aria-current='page'] { color: var(--text-muted); }

/* ---------- Sidebar card ---------- */
.sidebar {
  padding: 1.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.sidebar__title {
  margin-bottom: 0.6rem;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.sidebar__list { list-style: none; }
.sidebar__list a {
  display: block;
  padding: 0.5rem 0.65rem;
  margin-inline: -0.65rem;
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  transition: background-color var(--t-fast) var(--ease);
}
.sidebar__list a:hover { background: var(--highlight); color: var(--heading); }
.sidebar__list a[aria-current='page'] { background: var(--highlight); font-weight: 700; color: var(--heading); }
.sidebar__note { margin: 1rem 0 0; padding-top: 1rem; border-top: 1px solid var(--border); font-size: 0.95rem; color: var(--text-muted); }
.sidebar__form { margin-top: 0.75rem; }

/* ---------- Category chips and filter tabs ---------- */
.category-list,
.filter-tabs { display: flex; flex-wrap: wrap; gap: 0.5rem; list-style: none; }
.category-list { margin-bottom: var(--space-5); }

.category-list a,
.filter-tabs a {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--heading);
  text-decoration: none;
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.category-list a:hover,
.filter-tabs a:hover { background: var(--highlight); border-color: var(--accent); }
.category-list a[aria-current='true'],
.filter-tabs a[aria-current='true'] { background: var(--btn-bg); border-color: var(--btn-bg); color: var(--btn-text); }

/* ---------- Resource list (Knowledge Center listing) ---------- */
.resource-list {
  list-style: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.resource-item { padding: 1.25rem 1.5rem; }
.resource-item + .resource-item { border-top: 1px solid var(--border); }
.resource-item p:last-child { margin-bottom: 0; }
.resource-item__meta { margin-bottom: 0.25rem; font-size: var(--fs-small); color: var(--text-muted); }
.resource-item__title { margin-bottom: 0.35rem; font-size: 1.15rem; }
.resource-item__title a { color: inherit; text-decoration: none; }
.resource-item__title a:hover { color: var(--link); text-decoration: underline; }

.resource-item--listing { display: grid; gap: 0.75rem 1.25rem; }
@media (min-width: 40rem) {
  .resource-item--listing:has(.resource-item__img) { grid-template-columns: 12rem minmax(0, 1fr); }
}
.resource-item__img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.empty-state {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px dashed var(--accent);
  border-radius: var(--radius-lg);
  color: var(--text-2);
}

/* ---------- Pagination ---------- */
.pagination { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.75rem; }
.pagination__link {
  display: inline-flex;
  align-items: center;
  min-height: 2.6rem;
  padding: 0.4rem 1.1rem;
  border: 1px solid var(--btn-outline);
  border-radius: var(--radius);
  font-weight: 700;
  color: var(--btn-outline);
  text-decoration: none;
  transition: background-color var(--t-fast) var(--ease);
}
a.pagination__link:hover { background: var(--highlight); color: var(--link-hover); }
.pagination__link.is-disabled { border-color: var(--border); color: var(--text-muted); }
.pagination__status { color: var(--text-muted); }